Wright's Writing Corner — Great Books

On the topic of what makes a great book great:

http://www.ljagilamplighter.com/2010/12/01/wrights-writing-corner-writing-the-great-book-part-1-what-makes-a-book-great/
Excerpt:

First, we should distinguish between the two uses of the term “great books.” For clarity's sake, I shall refer to them as great books and Great Books.

A great book is a book you love. Perhaps, it is a book that changed your life. Perhaps, it is one you want to read again and again. Perhaps, it is one that rocked your world, or uplifted you in a time of darkness. Perhaps, it stirred your heart, ignited your passion, or brought you comfort. It is a book that touched you.

A Great Book is a book that did to a whole lot of people what a great book did to you. It is the same thing on a society level: a book that rocked many people’s world; or that introduced new ideas into society; or that led millions of readers to “burn with the bliss and suffer the sorrow of all mankind.” * It is a book that so many people found great that it outlasted the sandblast of Time, which otherwise clears away all things.

So what makes a book great?